This is my search code

<div id="search">
    <form method="get" action="http://www.other-website.com/search">
        <input type="hidden" name="f" value="">
        <input type="text" placeholder="Temukan informasi, komunitas & produk yang kamu cari disini" accesskey="s" name="q">
        <input type="submit" value="Search">
    </form>
</div>

This is the tag code (display only text "do not link")

<?php
$posttags = get_the_tags();
if ($posttags) {
  foreach($posttags as $tag) {
    echo $tag->name . ' ';
  }
}
?>

The code can apply well on the website, but I have to enter text to the search. I just want to place my tag on that search text

so my question is How to make fixed word(my tag) automatically placed on search or where I must place the tag code, the search result is mytag linked on @www.other-website.com/search so user do not have to type? I want to search my tag on other website search